Look at your unit from outside the house. The back of the air conditioner should be slightly lower than the front. If it is level or the front of the air conditioner is lower it will drip into the house. Some window units have a drain for the water outside and some don't. Look for a hole in the bottom of the unit outside and if you find one make sure it is not plugged. Also dirty coils can cause a frost buildup on the inside of the unit. This will drip also. If this is the case you should see the ice buildup by removing the front cover or removing the front filter.

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Inside of the unit is a drain hole that will drain out water to the drip pan. The drip pan is located under the unit and it uses the heat of the motor to evaporate the moisture that collects in it. The drain hole is plugged. Go on youtube and you can watch a video on how to fix it. Very easy.

This can be from one of couple sources. One would be a broken or missing rubber seal in the firewall. Water can and will enter the passenger compartment if the seal is not good or missing. The firewall is the metal between the engine compartment and passenger compartment. There are many penetrations in the firewall for throttle linkage, steering column, electrical harness, etc. All of these penetrations have seals to prevent water from entering. Check to make sure all penetrations have seals. Inspect from under hood and from under the car, too.

Another source is damage to the floor pan. If you went over a rock or jagged object without having enough clearance, it may have punctured or even sliced through the floor - under the carpeting and sound deadening material under it. If you live in a cold area, and the roads are treated with salt or chemicals to melt ice, it may have caused rusting holes to appear in the floor pan. Water spraying up from tires would enter through the puncture or slice and the carpet would wick the water in. It would take a long time to dry and give a musty smell after just a short time. You should inspect the floor pan from underneath the car. Look for punctures, slices and rust / rot. Clean and seal any openings found in the floor pan and firewall.

Fixed windows and glass in the car body are also sources for leaks. The is especially true if glass has recently been replaced. Many times, the back window leaks into the trunk or metal under the rear seat - and flows to the carpeted floor. Look in the trunk at the bottom of the rear window. Side windows can leak, too - so don't forget to look behind trim interior panels on the sides of the back seat. Your leak could be coming from the windshield, too - this will be harder to locate through the dashboard - but you may find water dripping from wires, etc. Look for evidence of water / rust. Clean and reseal body / glass joints when found.

When you say drip pan are you refering to a pan located under unit in case drain plugs ? If this is what you are talking about and you have a furnace that is 90% efficient or more which will be vented with pvc, it needs to be under the whole furnace as condensate water also comes from furnace when operating and if this drain plugs you will also have water leaking down from furnace. If it is a 80% furnace which will be vented into a chimney then pan needs to be just under a/c

dehumidification is something that AC units do as a by-product of cooling so yes, it is acting as a dehumidifier. there is a coil (copper tubing snaking back and forth through metal fins like on a radiator) that water condenses on and drips off of. That water will fall in to a pan and then will either evaporate or run through a drain. Make sure the path from the coil to the drain pan is clear. The water will either drip down (pan sloped to a corner or hole) or run through a tube to the drain pan. The drain pan is the part that had the drain plug in it. If that pan was dry the condensate is reaching the pan. If it is full that means either the drain is plugged up or the unit is pulling humidity out of the air faster than it can evaporate. Check to make sure any drain tube is clear and that the path for the condensate (water) is sloped the right way - not shaken loose or tipped to the wrong side.That should get you started. Let me know if I can be of any other help.

sounds like the overflow drain is picking up the water that means the main drain is clogged.you need to find the main drain pipe if lookin at the air handler in attic there should be 2 drains from unit one higher than other follow it and blow out drain they put the other overflow drain out the eve so if it stars leaking someone notices it and it doesnt damage cieling but it sound like it needs imediate attention befor it does go to the overflow pan and damage your cieling. i hope this helps and good luck

The "drip pan" is actually the entire base srround of the unit. There are two critical things you must confirm 1) is the unit angled back to the outside(you need water to flow away from the inside) and 2) there may be a plug/obstruction in the outer casing where the water is intended to drain from. You should check to see if either or both of these conditions exsist.

You need to blow out the drain line where it hooks up to the pan and clean out the drip pan. It doesn't matter how clean you keep the filter, that's just to keep the evaporator coils clean, which is important in itself. But algae will grow in the drip pan if it is not tilted to drain correctly and will clog up the drain line. If you put a level on the top of the unit, the bubble should JUST BARELY break the line on the OPPOSITE side from the drain outlet on the pan. Hope this helps.